CO2(g)+3H2(g)═CH3OH(g)+H2O(g)△H1
2CO(g)+O2(g)═2CO2(g)△H2
2H2(g)+O2(g)═2H2O(g)△H3
则CO(g)+2H2(g)⇌CH3OH(g)的△H═.
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